My DD was like this, and I will not lie, but the first 2-3 months were hell!
But that said, she now loves it and cant wait to get to school each morning
I would speak to the teachers, trust me they have been there, and done it, lots and lots of times.
My DD's teachers are fantasic as is the school, so really counting my blessings. They have a buddy system, who are year 3 - year 6 children especially chosen to look after the reception kids during playtimes and help them out as and when they need it.
Building up to going to school, I wouldnt make an issue out of it, but allow her to talk about it too.
Also, I know it is going to be hard, but when the time comes try to remain firm, but supportive. A few times I had to leave my DD in floods of tears, which broke my heart, but its the old thing of being cruel to be kind. I had to walk away, and I admit to having a few tears myself, but its all part of growing up. She would come bouncing out of school at the end of the day, but then in tears again the following morning!
I wish you all the best of luck in the world x